Evaluation of a frequency-dependent phase shift in chirped Raman lasers for atom gravimeters

Yaoyao Xu, Qingsong Wang, Jiafeng Cui, Huaqing Luo, Qin Luo, Xiaobing Deng, Minkang Zhou, Xiaochun Duan, Zhongkun Hu

Research output: Contribution to journalArticlepeer-review

Abstract

Light-pulse atom gravimetry has emerged as a powerful technique for precisely measuring absolute gravitational acceleration. Raman lasers are commonly used in this technique to coherently manipulate the atomic wave packet, of which the effective frequency is chirped continuously to compensate for the Doppler shift. In this study we investigate an additional phase shift in the Raman lasers that arises due to the frequency chirp. We directly measure this phase shift by recording the beat signal of the Raman lasers with a high-speed oscilloscope, providing an independent evaluation of the resultant error in atom gravimeters caused by this phase shift. Concurrently, we detect the influence of the additional phase shift on gravity measurements using our atom gravimeter, and the results are in good agreement with the independent evaluation. Notably, there may still be a residual error at the microgal level when performing differential measurements by reversing the direction of the effective wave vector of the Raman lasers. We propose that this residual error can in principle be eliminated by selecting the same chirp frequency range for both directions in the differential measurement.

Original languageEnglish
Article number062816
JournalPhysical Review A
Volume110
Issue number6
DOIs
StatePublished - Dec 2024

Funding

This work was supported by the National Natural Science Foundation of China (Grants No. 12205110, No. U2341247, No. 12204186, No. 12104174, No. 12274163, and No. 12474482).

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